Daily OFF Time Research Articles

The effects of safinamide according to gender in Chinese parkinsonian patients

The incidence and prevalence of Parkinson’s disease (PD) is expected to raise dramatically over the next decades. Gender-related differences are not yet widely recognized, particularly regarding the response to dopaminergic medications. To analyse gender differences in the clinical effects of safinamide, compared to placebo, in Chinese PD patients of the pivotal XINDI trial. The XINDI study was a phase III, randomized, double-blind, placebo-controlled, multicenter trial. Patients were followed for 16 weeks receiving safinamide or placebo as add-on to levodopa. The primary efficacy endpoint was the change in the mean total daily OFF time. Secondary efficacy endpoints included total daily ON time, ON time with no/non-troublesome dyskinesia, Unified Parkinson’s Disease Rating Scale and Parkinson's Disease Questionnaire-39 items. A post-hoc analysis was performed to describe the efficacy of safinamide in both genders on motor symptoms, motor fluctuations and quality of life. 128 (42%) out of 305 patients enrolled were women and 177 (58%) men. Our additional analyses of the XINDI study have shown that safinamide, compared to placebo, was associated with improvements in motor symptoms, motor fluctuations and quality of life in both genders, with some differences in the response that did not reach statistical significance, possibly due to sample size limitation and post-hoc design of the study. The changes from baseline at week 16 were > 50% higher in the females compared to males for the total daily OFF time (− 1.149 h vs − 0.764 h in males), the total daily ON time (1.283 h vs 0.441 h in males), the UPDRS total score (− 8.300 points vs − 5.253 points in males) and the UPDRS part II score (− 2.574 points vs − 1.016 points in males). The changes from baseline at week 16 were higher in the females compared to males in the “ADL” domain (− 6.965 points vs − 5.772 points in males), the “Emotional well-being” domain (− 6.243 points vs − 4.203 in males), the “Stigma” domain (− 6.185 points vs − 4.913 points in males) and the “Bodily discomfort” domain (− 5.196 points vs 1.099 points in males), while were higher in males in the “Mobility” score (− 6.523 points vs − 4.961 points in females) and the “Communication” score (− 3.863 points vs − 1.564 points in females). Safinamide was shown to improve PD symptoms and quality of life in both male and female Chinese patients. Possible differences in the response between genders need to be further studied in larger and different ethnic populations.

Comparative efficacy and safety of adjunctive drugs to levodopa for fluctuating Parkinson’s disease - network meta-analysis

It remains unclear which adjunctive drug for Parkinson’s disease (PD) in combination with levodopa is more effective, tolerable, and safe. We aimed to compare the efficacy, tolerability, and safety among anti-PD drugs from several classes in patients with fluctuating PD who received levodopa through network meta-analysis (NMA). Twelve anti-PD drugs belonging to 4 different drug classes (dopamine agonists, monoamine oxidase type B inhibitors, catechol-O-methyl transferase inhibitors, and an adenosine A2A receptor antagonist) were selected. We systematically searched PubMed, Embase, and the Cochrane Library for eligible randomized controlled trials (RCTs) comparing placebo with anti-PD drug or among anti-PD drugs in patients with PD who experienced motor fluctuations or wearing-off and received levodopa. We included 54 RCTs in the analysis. The NMA was performed under a frequentist framework using a random-effects model. The efficacy outcome was change in daily off-time, and the tolerability outcome was discontinuation due to all causes. Safety outcomes included discontinuation due to adverse events (AEs) and the incidence of AEs, dyskinesia, hallucination, and orthostatic hypotension. According to the surface under the cumulative ranking curve (SUCRA) in the NMA, ropinirole transdermal patch (SUCRA, 0.861) ranked the highest in efficacy, followed by pramipexole (0.762), ropinirole extended release (ER) (0.750), and safinamide (0.691). In terms of tolerability, ropinirole (0.954) ranked the highest, followed by pramipexole (0.857), safinamide (0.717), and ropinirole ER (0.708). Each anti-PD drug had different SUCRA ranking profiles for the safety outcomes. These findings suggest that ropinirole, pramipexole, and safinamide are well-balanced anti-PD drugs that satisfy both efficacy and tolerability outcomes.

IPX203 vs Immediate-Release Carbidopa-Levodopa for the Treatment of Motor Fluctuations in Parkinson Disease

Levodopa has a short half-life and a limited window of opportunity for absorption in the proximal small intestine. IPX203 is an oral, extended-release formulation of carbidopa-levodopa developed to address these limitations. To assess the efficacy and safety of IPX203 vs immediate-release carbidopa-levodopa in patients with Parkinson disease who are experiencing motor fluctuations. RISE-PD was a 20-week, randomized, double-blind, double-dummy, active-controlled, phase 3 clinical trial. The study was conducted between November 6, 2018, and June 15, 2021, at 105 academic and clinical centers in the US and Europe. Patients with Parkinson disease taking a total daily dose of 400 mg or more of levodopa and experiencing an average of 2.5 hours or more daily off-time were included in the study. A total of 770 patients were screened, 140 were excluded (those taking controlled-release carbidopa-levodopa apart from a single daily bedtime dose, Rytary (Amneal Pharmaceuticals), additional carbidopa or benserazide, or catechol O-methyl transferase inhibitors or who had a history of psychosis within the past 10 years), and 630 were enrolled in the trial. Following open-label immediate-release carbidopa-levodopa dose adjustment (3 weeks) and conversion to IPX203 (4 weeks), patients were randomized in a 1:1 ratio to double-blind, double-dummy treatment with immediate-release carbidopa-levodopa or IPX203 for 13 weeks. The primary end point was mean change in daily good on-time (ie, on-time without troublesome dyskinesia) from baseline to the end of the double-blind treatment period. A total of 630 patients (mean [SD] age, 66.5 [8.95] years; 396 [62.9%] men) were enrolled, and 506 patients were randomly assigned to receive IPX203 (n = 256) or immediate-release carbidopa-levodopa (n = 250). The study met its primary end point, demonstrating statistically significant improvement in daily good on-time for IPX203 compared to immediate-release carbidopa-levodopa (least squares mean, 0.53 hours; 95% CI, 0.09-0.97; P = .02), with IPX203 dosed a mean 3 times per day vs 5 times per day for immediate-release carbidopa-levodopa. Good on-time per dose increased by 1.55 hours with IPX203 compared to immediate-release carbidopa-levodopa (95% CI, 1.37-1.73; P < .001). IPX203 was well tolerated. The most common adverse events in the double-blind phase (IPX203 vs immediate-release carbidopa-levodopa) were nausea (4.3% vs 0.8%) and anxiety (2.7% vs 0.0%). In this study, IPX203 provided more hours of good on-time per day than immediate-release carbidopa-levodopa, even as IPX203 was dosed less frequently. ClinicalTrials.gov Identifier: NCT03670953.

Importance of time to ON versus wearing OFF in total daily OFF time experienced by patients with Parkinson's disease

Most patients with Parkinson's disease (PD) receiving levodopa (LD)/DOPA decarboxylase inhibitors develop motor fluctuations with an increasing amount of OFF time, negatively impacting patient quality of life. Herein, we review the evidence supporting the substantial, yet underappreciated contribution of delays in time to ON (including delayed ON and no ON) to total daily OFF time. Most clinical studies use patient diaries that do not capture time to ON and wearing OFF separately as related to LD dosing, and consequently, most OFF time has generally been attributed to wearing OFF. Hence, most treatment regimens focus on reducing wearing OFF by changing LD dosing/formulations and/or using “ON-extenders” (eg, catechol-o-methyltransferase inhibitors, monoamine oxidase-B inhibitors, extended-release amantadine, and adenosine A2A receptor antagonists). However, the literature describing approved treatments for PD that has focused on delays in time to ON is sparse and suggests this type of OFF may comprise more than twice the amount of total daily OFF time as wearing OFF. Here, we advocate for the importance of measuring and adequately addressing delays in time to ON and build support for the consistent inclusion of the time to ON measurement in future clinical trials.

Levodopa-Carbidopa Intestinal Gel for Parkinson's Disease over 11 years: One Center's "Real-World" Experience.

Levodopa-carbidopa intestinal gel (LCIG) therapy has been shown to be a safe and effective treatment for advanced Parkinson's disease (PD). Limited data are available regarding long-term benefits and complications in Canada. Objective of the study was to review long-term experience and clinical outcomes in PD patients with LCIG therapy over 11 years in a multidisciplinary University clinic setting. Chart review was done on PD patients with LCIG from 2011 to 2022. Data collected: dosing, UPDRS-III motor scores, OFF times, hours with dyskinesias, MoCA, complications, discontinuation reasons, and nursing time requirements. Thirty-three patients received LCIG therapy with a mean follow-up of 3.25±2.09 years. UPDRS-III scores showed reduction of 15% from baseline (mean 35.9) up to 4 years (mean 30.4). Daily OFF time improved from baseline (mean 7.1 ± 3.13 hours) up to 5 years (mean 3.3 ± 2.31 hours; -53.5%; p < 0.048), and dyskinesias remained stable. Nursing time averaged 22 hours per patient per year after PEG-J insertion and titration. Most common complications were PEG-J tube dislodgement and stoma site infection (0-3zero to three events/patient/year). Serious side effects were seen in four (12%) patients resulting in hospitalization and/or death. Nine patients (27.2%) discontinued the treatment due to lack of improved efficacy over oral therapy or development of dementia and 10 (30%) died of causes unrelated to LCIG infusion. Patients on LCIG showed improved motor function over 5-year follow-up. Serious complications were uncommon. Dedicated nursing time is required by LCIG-trained nurses in a multidisciplinary setting for optimum management.

P 81 ELEGANCE – A prospective non-interventional study of the long-term effectiveness and safety of levodopa–entacapone–carbidopa intestinal gel (LECIG) in patients with advanced Parkinson's disease in routine care

Background: Levodopa–entacapone–carbidopa intestinal gel (LECIG) is a device-aided therapy option introduced in 2021 that has received marketing authorisation in several European countries for the treatment of patients with advanced Parkinson’s disease (PD) who have motor complications that cannot be adequately controlled by optimised oral/transdermal PD medication. The presence of entacapone in LECIG increases the bioavailability of levodopa compared with standard levodopa–carbidopa intestinal gel, allowing a reduced levodopa dose (by 20–35%) to be given to achieve the same effective plasma levodopa levels. The ELEGANCE study has been established to collect real-world data on the efficacy and safety of LECIG in clinical practice use. Study design: ELEGANCE is an international, prospective, non-interventional, observational study that will be undertaken in ∼16 countries, including Germany and Austria, once marketing authorisation for LECIG is received. Study centres will offer participation in the ELEGANCE study to all adult patients with advanced PD who have severe motor fluctuations and hyperkinesia or dyskinesia despite taking optimised or transdermal PD therapy and who have been prescribed treatment with LECIG as part of routine clinical practice. Subjects can be de novo patients or those who switch from another infusion therapy. The planned total number of patients to be recruited to the study is ∼300 across all countries. In Germany and Austria, it is planned that around 15 centres will participate with the aim of recruiting ∼75 patients. Patients will be followed for 24 months or until study discontinuation. Data collection commenced July 2021, and recruitment is planned until in July 2022 with study completion in Q2 2024. An interim analysis will be performed. Study endpoints: Primary objectives are to evaluate the long-term efficacy and safety of LECIG over 24 months. Efficacy evaluations will include effect on motor symptoms (change from baseline to 24 months in daily OFF time [MDS-UPDRS IV] and motor aspects of experiences of daily living [MDS-UPDRS II] scores), required levodopa dose, use of other PD medication, Clinical and Patient Global Impression, and satisfaction with treatment. Adverse events will be monitored for evaluation of safety. Secondary objectives are to investigate patients‘ non-motor symptoms (change from baseline in Non-Motor Symptom Scale Score, Parkinson's disease sleep scale-2, and MDS-UPDRS lb scores), quality of life (change from baseline in Parkinson's Disease Questionnaire total score [PDQ-8 or PDQ-39]), and healthcare resource utilisation (complications of PD leading to hospitalisation, problems with medication or device). Conclusions: The data generated from ELEGANCE will provide valuable real-world information on the efficacy and safety of LECIG, as well as on patient perspectives of this treatment and its impact on healthcare utilisation that can help inform clinical decisions and policy making.

Criteria for identification of advanced Parkinson\u2019s disease: the results of the Italian subgroup of OBSERVE-PD observational study

BackgroundFrequency of Advanced Parkinson’s Disease (APD) and its clinical characteristics are still not well defined. Here, we aimed to assess APD prevalence in the Italian OBSERVE-PD cohort, as well as treatment eligibility to device-aided therapies (DAT), and to compare the APD clinical judgment with the established Delphi criteria.MethodsThis sub-group analysis of the OBSERVE-PD study was performed on patients enrolled by 9 Movement Disorders centers in Italy. Motor and non-motor symptoms, PD characteristics, activities of daily living, and quality of life were assessed. Patient eligibility for DAT, response to current PD treatments, referral process, and the concordance between APD physician’s judgment and Delphi criteria were also assessed.ResultsAccording to physician’s judgment, 60 out of 140 patients (43%) had APD. The correlation between physician’s judgment and the overall APD Delphi criteria was substantial (K = 0.743; 95%CI 0.633–0.853), mainly driven by a discrete concordance found for the presence of ≥ 2 h of daily OFF time, presence of troublesome dyskinesia, ≥ 5 times daily oral levodopa dosing, and activities of daily living limitation. Forty-four (73%) APD patients were considered eligible to DAT but only 18 of them (41%) used these therapies, while most patients, independently from their eligibility, continued to use 3–5 oral daily medications, due to fear of invasive solutions and need to have a longer time to decide.ConclusionAPD was frequent in the Italian OBSERVE-PD population. DAT in the eligible APD population proved to be underused, in spite of unsatisfactory symptoms control with oral medications in 67% of patients.

Parkinson's disease and Covid-19: Is there an impact of ethnicity and the need for palliative care.

Under the traditional models of care for People with Parkinson's Disease (PD, PwP), many of their needs remain unmet and a substantial burden of motor and non-motor symptoms they experience may not be tackled sufficiently. An introduction of palliative care (PC) interventions early in the course of PD offers profound benefits: it may improve quality of life of patients, their families and caregivers through the prevention and relief of medical symptoms, while, at the same time, emphasizing their emotional needs and spiritual wellbeing, establishing goals of care, and engaging in the advance care planning (ACP).The ongoing Coronavirus Disease 2019 (Covid-19) pandemic poses an unprecedented set of challenges for PwP and has in many ways (both directly and indirectly) magnified their suffering, thus rapidly raising the demand for PC interventions. Covid-19, as well as the repercussions of prolonged mobility restrictions and limited health-care access might exacerbate the severity of PD motor symptoms and interact negatively with a range of non-motor symptoms, with a detrimental effect on quality of life. Greater motor disability, higher amount of levodopa-induced motor fluctuations with an increased daily off-time, fatigue, anxiety, depression, sleep disturbances, pain and worsening of cognitive complaints might dominate the clinical presentation in PwP during the Covid-19 pandemic, alongside raising psychological and spiritual concerns and anticipatory grief.Here, we aim to provide a foundation for pragmatic and clinically orientated PC approach to improve quality of life and relieve suffering of PwP in the context of the current, ongoing Covid-19 pandemic.

Long-term safety and efficacy of apomorphine infusion in Parkinson's disease patients with persistent motor fluctuations: Results of the open-label phase of the TOLEDO study

IntroductionThe randomized, double-blind phase (DBP) of the TOLEDO study confirmed the efficacy of apomorphine infusion (APO) in reducing OFF time in PD patients with persistent motor fluctuations despite optimized oral/transdermal therapy. Here we report safety and efficacy results including the 52-week open-label phase (OLP). MethodsAll patients completing the 12-week DBP (including those switching early to open-label treatment) were offered OLP entry. The primary objective was the evaluation of long-term safety of APO. ResultsEighty-four patients entered the OLP (40 previously on APO, 44 on placebo) and 59 patients (70.2%) completed the study. The safety profile of APO was consistent with experience from extensive clinical use. Common treatment-related adverse events (AEs) were mild or moderate infusion site nodules, somnolence and nausea. Fourteen (16.7%) patients discontinued the OLP due to AEs, those involving >1 patient were infusion site reactions (n = 4) and fatigue (n = 2); hemolytic anemia occurred in one case. Reduction in daily OFF time and improvement in ON time without troublesome dyskinesia were sustained for up to 64 weeks. Pooled data for week 64 (n = 55) showed a mean (SD) change from DBP baseline in daily OFF time of −3.66 (2.72) hours and in ON time without troublesome dyskinesia of 3.31 (3.12) hours. Mean (±SD) daily levodopa-equivalent dose decreased from DBP baseline to week 64 by 543 mg (±674) and levodopa dose by 273 mg (±515). ConclusionsThe safety and efficacy of APO infusion were demonstrated with long-term use for persistent motor fluctuations, allowing substantial reductions in oral PD medication.

A 12-month, dose-level blinded safety and efficacy study of levodopa inhalation powder (CVT-301, Inbrija) in patients with Parkinson's disease

IntroductionCVT-301 (Inbrija®) is a levodopa inhalation powder for on-demand treatment of OFF episodes in Parkinson's disease patients treated with carbidopa/levodopa. Safety and efficacy results of a 12-month, dose-level blinded extension study of a phase 3 trial (SPAN℠-PD) of CVT-301 are presented. MethodsPatients were receiving oral carbidopa/levodopa and adjunctive CVT-301 treatment, blinded to dose (60 mg or 84 mg, N = 325). Study visits occurred every 3 months. Pulmonary function was assessed by spirometry. Other safety assessments included dyskinesia and adverse events (AEs). Secondary objectives of the study included maintenance of improvement assessments for occurrence of an ON state during the 60-min post-dose period, change in total daily OFF time, and Patient Global Impression of Change (PGIC). ResultsMost frequent AEs (≥5%) were cough (15.4%), fall (13.1%), upper respiratory tract infection (7.1%), and dyskinesia (5.1%). Severe AEs (>1 event) were cough (1.9%) and dyskinesia (0.6%). Twelve-month mean changes from baseline for FEV1, FVC, and DLCO were −0.092 L, −0.097 L, and −0.922 mL/min/mmHg, respectively. At 12 months, 73.0% of patients on 84 mg achieved an ON state within 60 min. Total daily OFF time was reduced by 0.55 h (month 1) and 0.88 h (month 12) for the 84 mg dose. Percentage of patients self-reported as improved by PGIC was 65.5–91.9% over 12 months. ConclusionCVT-301 was generally well-tolerated. Twelve-month decline in pulmonary function was consistent with a prior PD control group. Exploratory efficacy results showed CVT-301 maintained improvement at achieving ON states in patients experiencing OFF episodes, decreasing daily OFF time, and maintaining improvement in PGIC.

A Spanish Consensus on the Use of Safinamide for Parkinson's Disease in Clinical Practice.

Safinamide is an approved drug for the treatment of motor fluctuations in Parkinson’s disease (PD). Scarce data are available on its use in clinical practice. A group of Spanish movement disorders specialists was convened to review the use of safinamide across different clinical scenarios that may guide neurologists in clinical practice. Eight specialists with recognized expertise in PD management elaborated the statements based on available evidence in the literature and on their clinical experience. The RAND/UCLA method was carried, with final conclusions accepted after a 2-round modified Delphi process. Higher level of agreement between panellists was reached for the following statements. Safinamide significantly improves mean daily OFF time without troublesome dyskinesias. Adjunctive treatment with safinamide is associated with motor improvements in patients with mid-to-late PD. The efficacy of safinamide on motor fluctuations is maintained at long-term, with no increase over time in dyskinesias severity. The clinical benefits of safinamide on pain and depression remain unclear. Safinamide presents a similar incidence of adverse events compared with placebo. The efficacy and safety of safinamide shown in the pivotal clinical trials are reproduced in clinical practice, with improvement of parkinsonian symptoms, decrease of daily OFF time, control of dyskinesias at the long term, and good tolerability and safety.

Rasagiline combined with levodopa therapy versus levodopa monotherapy for patients with Parkinson’s disease: a systematic review

The aim of this report was to systematically evaluate the efficacy and safety of rasagiline (R) plus levodopa (L) (R + L) for the treatment of Parkinson's disease (PD) compared with that of L monotherapy, in order to provide a reference resource for rational drug use. Randomized controlled trials (RCTs) of R + L for PD published up to September 2018 were searched. Sensitivity analyses were also performed. Fourteen RCTs with 2531 participants were included. Compared with L monotherapy, the pooled effects of R + L combination therapy on unified Parkinson's disease rating scale (UPDRS) score were (SMD -0.50, 95% CI -0.70 to - 0.30, P < 0.00001) for UPDRS motor score, (SMD -0.59, 95% CI -0.79 to - 0.39, P < 0.00001) for UPDRS activities of daily living (ADL) score, (SMD -0.65, 95% CI -0.81 to - 0.49, P < 0.00001) for UPDRS total score. R + L combination therapy was better than L monotherapy in reducing daily off-time (SMD -1.15, 95% CI -2.13 to - 0.17, P = 0.02), but there was a statistically nonsignificant result in daily on-time increase (SMD 1.39, 95% CI -0.69 to 3.48, P = 0.19). There were no statistical differences in number of adverse events (OR 1.33, 95% CI 0.97 to 1.82, P= 0.07) and number of dropout (OR 0.88, 95% CI 0.65 to 1.19, P = 0.39) between R + L combination therapy and L monotherapy. R + L combination therapy was superior to L monotherapy for improvement of UPDRS scores and off-time in PD patients. Moreover, R + L combination therapy and L monotherapy were similar in terms of safety and tolerability.

Long-term safety and efficacy of adjunctive rasagiline in levodopa-treated Japanese patients with Parkinson\u2019s disease

Rasagiline is a monoamine oxidase type-B inhibitor in development in Japan for Parkinson’s disease (PD). This open-label study evaluated the long-term safety and efficacy of rasagiline in Japanese patients with PD receiving levodopa. Patients were aged 30–79 years and had wearing-off or weakened effect. Patients received rasagiline 1 mg/day for 52 weeks. The primary objective was to evaluate safety. Secondary endpoints included MDS-UPDRS Part II and Part III total scores (ON-state) and change from baseline in mean daily OFF-time. An additional endpoint was the Parkinson’s Disease Questionnaire-39 (PDQ-39) Summary Index (SI) score. In total, 222 patients were enrolled; 52.3% had wearing-off phenomena. Treatment-emergent adverse events (TEAEs) were mostly mild or moderate and occurred in 83.3% of patients; 63.1% had drug-related TEAEs; and 21.2% had TEAEs resulting in discontinuation. Fall (16.7%), nasopharyngitis (14.0%), and dyskinesia (10.8%) were the most frequent TEAEs. Serious TEAEs were reported in 17.6% of patients, and led to discontinuation in 9.5%. At week 52 (last-observation-carried forward), the mean change from baseline in MDS-UPDRS Part III total score (ON-state) was − 7.6; the mean change from baseline in daily OFF-time was − 0.89 h in patients with wearing-off phenomena at the start of the run-in period. The mean change from baseline in PDQ-39 SI was − 0.64. No major safety issues were observed during this 52-week trial of rasagiline as an adjunct to levodopa in Japanese patients. Mean changes in MDS-UPDRS scores and daily OFF-time suggested that adjunctive rasagiline treatment with levodopa was efficacious, with efficacy maintained for at least 52 weeks.

Adjunct rasagiline to treat Parkinson\u2019s disease with motor fluctuations: a randomized, double-blind study in China

BackgroundThe use of adjunct rasagiline in levodopa-treated patients with Parkinson’s disease and motor fluctuations is supported by findings from large-scale clinical studies. This study is to investigate the efficacy and safety of adjunct rasagiline in Chinese patients with Parkinson’s disease, as a product registration study.MethodsThis 16-week, randomized, double-blind, parallel-group, multicenter, placebo-controlled study of rasagiline 1 mg/day included levodopa-treated patients with Parkinson’s disease and motor fluctuations. The primary efficacy endpoint was mean change from baseline in total daily OFF time over 16 weeks. Secondary endpoints were Clinical Global Impressions – Improvement (CGI-I), and change in Unified Parkinson’s Disease Rating Scale (UPDRS) Activities of daily living (ADL) and Motor scores. Patient well-being (EQ-5D), and the frequency of adverse events were also assessed.ResultsIn total, 324 levodopa-treated patients were randomized to rasagiline 1 mg/day (n = 165) or placebo (n = 159). Over 16 weeks, rasagiline statistically significantly reduced the mean [95% confidence interval] total daily OFF time versus placebo (− 0.5 h [− 0.92, − 0.07]; p = 0.023). There were also statistically significant improvements versus placebo in CGI-I (− 0.4 points [− 0.61, − 0.22]; p < 0.001), UPDRS-ADL OFF (− 1.0 points [− 1.75, − 0.27]; p = 0.008), and UPDRS-Motor ON (− 1.6 points [− 3.05, − 0.14]; p = 0.032) scores, as well as the EQ-5D utility index (p < 0.05). Rasagiline was safe and well tolerated.ConclusionsIn levodopa-treated Chinese patients with Parkinson’s disease and motor fluctuations, adjunct rasagiline 1 mg/day statistically significantly reduced OFF time, and improved daily function and overall well-being, versus placebo. Consistent with findings in other countries, adjunct rasagiline was proven efficacious and well tolerated in Chinese patients.Trial registration numberNCT01479530. Registered 22 November 2011.

Efficacy and safety of amantadine for the treatment of L-DOPA-induced dyskinesia.

L-DOPA induced dyskinesias (LIDs) may affect up to 40% of Parkinson's disease (PD) and impact negatively health-related quality of life. Amantadine has demonstrated significant antidyskinetic effects in animal PD models and in randomized double-blind placebo-controlled trials (RCTs) in patients with PD. These effects are thought to be related to the blockade of NMDA receptors modulating cortico-striatal glutamatergic-dopaminergic interactions involved in the genesis of LIDs. There are three pharmaceutical forms of amantadine currently available in the market: an oral immediate-release (IR) formulation, which is widely available; an extended-release (ER) formulation (ADS-5102) which has been recently developed and approved by the FDA; and an intravenous infusion (IV) solution, which is not commonly used in clinical practice. RCTs with amantadine IR or ER, involving more than 650 patients have shown consistent and long-lasting reductions in LIDs. Interestingly, ADS-5102 not only reduced LIDs, but also reduced significantly at the same time the duration of daily OFF-time, a unique finding compared with other antiparkinsonian medications that usually reduce time spent OFF at the cost of worsening of LIDs. Amantadine IR might also have possible effects on other PD symptoms such as apathy or fatigue. The most common adverse reactions with amantadine are constipation, cardiovascular dysfunction including QT prolongation, orthostatic hypotension and edema, neuropsychiatric symptoms such as hallucinations, confusion and delirium, nausea and livedo reticularis. Corneal degeneration is rare but critical. In summary, amantadine immediate and extended-release are effective and safe for the treatment of LIDs.

Efficacy and safety of perampanel in Parkinson's disease. A systematic review with meta-analysis.

L-Dopa represents the mainstay of therapy of Parkinson's disease (PD), but its effectiveness is reduced with continued treatment and disease progression. Accordingly, there remains a need to explore novel treatment strategies to manage the signs and symptoms of the later disease stages. The aim of the study was to evaluate the efficacy and safety of adjunctive perampanel (PER) in patients with PD through a meta-analysis of existing trials. Randomized, placebo-controlled, double- or single-blind, add-on studies of PER in patients with PD were identified through a systematic literature search. The following outcomes were assessed: changes from baseline to final efficacy visit in total daily OFF time, activities of daily living during OFF time and motor function during ON time, incidence of adverse events (AEs), and treatment withdrawal. Four trials were included involving 2266 participants, 1449 and 817 for PER and placebo treatment groups, respectively. Four PER daily doses were tested, namely 0.5, 1, 2 and 4mg. There were no significant differences in any efficacy outcome between PER and placebo treated patients. The risk ratios (RRs) for AEs, severe AEs and treatment withdrawal were similar between placebo and PER at 0.5, 1 and 2mg; the 4mg daily dose was associated with an increased risk of AEs [RR 1.118 (1.047-1.193)], and withdrawal for AEs [RR 1.345 (1.034-1.749)] and for any reason [RR 1.197 (1.020-1.406)]. In PD patients experiencing motor fluctuations, adjunctive PER did not improve the motor state and was well-tolerated at the lower doses.

The Efficacy of Istradefylline for Treating Mild Wearing-Off in Parkinson Disease

The adenosine A2A antagonist istradefylline has been used to treat Parkinson disease (PD) with symptoms of wearing-off since 2013 in Japan. Previous randomized controlled trials of istradefylline compared with placebo included PD patients experiencing an average daily OFF time of more than 2 hours. The purpose of this study is to assess the efficacy of 20 mg/d istradefylline in PD subjects experiencing an average daily OFF time of 3 hours or less. Fifteen patients were enrolled into this retrospective study. They received 20 mg/d istradefylline for 12 weeks. Changes in the Unified Parkinson's Disease Rating Scale part III scores in the ON state (ON-UPDRS-III) scores and daily OFF time were assessed at baseline and after 4, 8, and 12 weeks of administration of istradefylline. At baseline, all subjects had shorter daily OFF times, lower doses of L-DOPA and higher ON-UPDRS-III scores than those in previous randomized controlled trials. Twelve weeks of istradefylline significantly reduced ON-UPDRS-III scores (P < 0.001, Wilcoxon signed rank test). Eleven patients (73%) showed more than 50% reductions in ON-UPDRS-III scores. Improvement of ON-UPDRS-III was significantly correlated with baseline ON-UPDRS-III, and the mean ON-UPDRS-III score at end point was 12.1. Our result suggests that 20 mg/d istradefylline significantly improved motor functions in PD patients with mild wearing-off.

The efficacy of istradefylline for treating mild wearing-off in Parkinson's disease

Background: The adenosine A2A antagonist istradefylline has been used to treat Parkinson's disease (PD) with symptoms of wearing-off since 2013 in Japan. Previous randomized controlled trials (RCTs) of istradefylline compared with placebo included PD patients experiencing an average daily OFF time of > 2 hours.

Gastroretentive carbidopa/levodopa, DM-1992, for the treatment of advanced Parkinson's disease

This study was undertaken to compare efficacy, tolerability, and pharmacokinetics of DM-1992, an extended-release formulation of carbidopa/levodopa (CD/L-dopa) with immediate-release (IR) CD/L-dopa in patients with advanced Parkinson's disease. This randomized, open-label, crossover study included a 3-d baseline and two 10-d treatment periods. Patients with daily OFF time of 2.5 h or more taking 400 mg or more L-dopa/d in four or more divided doses were titrated to stable regimens of DM-1992 2 times per day or CD/L-dopa IR 3 times to 8 times per day. Patients were allowed to take rescue CD/L-dopa as needed. Using home diaries, patients recorded OFF time and ON time with or without troublesome dyskinesia during baseline and treatment days 7 through 9. During 12-h clinic visits on day 10, plasma samples were collected for pharmacokinetics, and motor performance was assessed hourly. Thirty-four patients were enrolled; mean baseline L-dopa dosage was 968 mg/d. After titration, CD/L-dopa IR was dosed 4.8 times per day and DM-1992, 2 times per day. Rescue CD/L-dopa IR was given 1.3 times during the DM-1992 arm and 0.2 times during the CD/L-dopa IR arm. The reduction from baseline in % OFF time was greater for DM-1992 compared with CD/L-dopa IR (-5.52% vs. +1.33%; P = 0.0471). At steady-state, compared with CD/L-dopa IR, DM-1992 exhibited a smoother plasma L-dopa concentration profile mostly because of a significantly higher (day 10) predose L-dopa concentration, associated with enhanced motor performance. Although more patients taking DM-1992 had one or more adverse events (AEs) than CD/L-dopa IR patients (35% vs. 15%), no pattern to the AEs was seen, nor any resulting discontinuations. DM-1992 was associated with a reduction in %OFF time compared with CD/L-dopa IR despite a reduced dosing frequency. Although the open-label study design and the greater number of rescue doses during the DM-1992 arm call for caution in interpreting the results, the elevated predose plasma L-dopa concentration (12 h after DM-1992 administration) lends objective support to our findings, suggesting that phase 3 studies are warranted.

Tozadenant (SYN115) in patients with Parkinson's disease who have motor fluctuations on levodopa: a phase 2b, double-blind, randomised trial

Many patients with Parkinson's disease have motor fluctuations despite treatment with available drugs. Tozadenant (SYN115) is an oral, selective adenosine A2A receptor antagonist that improves motor function in animal models of Parkinson's disease. We aimed to assess the safety and efficacy of tozadenant as an adjunct to levodopa in patients with Parkinson's disease who have motor fluctuations on levodopa. We did an international, multicentre, phase 2b, randomised, double-blind, placebo-controlled, parallel-group, dose-finding clinical trial of tozadenant in levodopa-treated patients with Parkinson's disease who had motor fluctuations (at least 2·5 h off-time per day). Eligible patients were randomly assigned via a computer-generated randomisation schedule to receive tozadenant 60, 120, 180, or 240 mg or matching placebo twice daily for 12 weeks. All study management, site personnel, and patients were masked to treatment assignment. The primary outcome was change from baseline to week 12 in hours per day spent in the off-state (assessed from Parkinson's disease diaries completed by patients). This study is registered at ClinicalTrials.gov, number NCT01283594. Of 420 randomised patients (mean age 63·3 [SD 8·3] years; mean duration of Parkinson's disease 8·7 [4·7] years), 403 provided post-baseline diary data and 337 completed study treatment. Compared with placebo, mean daily off-time was significantly reduced in the combined tozadenant 120 mg twice-daily and 180 mg twice-daily group (-1·1 h, 95% CI -1·8 to -0·5; p=0·0006), the tozadenant 120 mg twice-daily group (-1·1 h, -1·8 to -0·4; p=0.0039), and the tozadenant 180 mg twice-daily group (-1·2 h, -1·9 to -0·4; p=0·0039). The most common adverse events in these groups were dyskinesia (seven [8%] of 84 patients in the placebo group, 13 [16%] of 82 in the 120 mg twice-daily group, and 17 [20%] of 85 in the 180 mg twice-daily group), nausea (three [4%], 9 [11%], and ten [12%]), and dizziness (one [1%], four [5%], and 11 [13%]). Tozadenant 60 mg twice daily was not associated with a significant reduction in off-time, and tozadenant 240 mg twice daily was associated with an increased rate of discontinuation because of adverse events (17 [20%] of 84 patients). Tozadenant at 120 or 180 mg twice daily was generally well tolerated and was effective at reducing off-time. Further investigation of tozadenant treatment in phase 3 trials is warranted. Biotie Therapies.